<!doctype html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport"
          content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
        div {
            width: 500px;
            height: 500px;
            background-color: #000;
            position: relative;
        }
        .div {
            width: 50px;
            height: 87px;
            background-color: chocolate;
            position: absolute;
            left: 400px;
            right: 500px;
        }
    </style>
</head>
<body>
<div>
    <div class="div"></div>
</div>
</body>
</html>